Firearm.



PATENTED MAY 14. 1907.

M. MONDRAGON.

A No. 853,715.

FIREARM.

APPLICATION FILED AUG. s, 1904.

Amm wml nl a SHEETS-SHEET a. W

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PATENTED MAY 14, 1907.

M. MONDRAGON.

FIREARM.

APPLIOATIQN FILED AUG. s, 1904.

PATENTED MAY 14. 1907.

M. MONDRAGON.

PIREARM.

APPLIOATION FILED AUG. a. 1904.

8 SHEETS-SHEET 4.

Gttozmga PATBNTED MAY 14, 190'7.

M. MONDRAGON.

PIREARM.

APPLIoATIoN FILED AUG.a,19o4.

8 SHEETS-SHEET 5.

PATENTED MAY 14, 1907.

M. MONDRAGON.

FIREARM.

APPLIOATION FILED AUG. s, 1904.

8 SHEETS-SHEET 8.

wilimnows u @Honiara No. sf. l PATENTBD MAY 14, 1907.

. M. MONDRAGGN.

PIREARM.

APPLIoATIoN FILED AUG. s, 1904.

8 SHEETS-SHEET 7.

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Streuung@ PATENTED MAY 14, 1907.

M. MONDRAGON.

PIREARM.

APPLICATION FILED AUG. s, 1904.

@SHEETS-SHEET 8.

Snowdon QmMaow/a MANUEL MONDRAGON, OF TACUBAYA, MEXICO.

FIREARIVI.

Specification of Letters Patent.

Patented May 14, 1907'` Application filed Aug-11st 8,1904. Serial No. 219.989.

` My present invention pertains to improvements in automatic firearms, and relates more particularly to that class generally known as or styled gas-operated, though l the arm Ais equally adapted to be operated lso manually, either as n. sinvle-loade O1' il. T6- peater.

The invention is illustrated in the accompanying drawings, in which:

lFigure 1 is a longitudinal vertical sectional v iew of the rear portion of the arm; Fig. 2 a similar view, showing the forward portion of the saine,J and in fact being a continuation of the arm disclosed in Fig. 1; Fig. 3 a side elevation of the arm, with portions thereof broken away, .the breech-bolt beingl shown partly in section and the housing for the same wholly in section; Fig. 4 a similar view, with the breech-bolt moved forward and locked in position ready for firing; Fig. 5 a perspective view of the operative mechanism of the gun, the forestock being omitted; Fig. 6 e perspective view of the runner-bar or actuating-rod andits connections, seen from the side opposite to that shown in Fig. 5'; Fig. 7 a vertical transverse sectional view on the line 7-7 of Fig. 6; Fig. 8 a longitudinal sectional view of the bolt, showing the parts in their retracted position, the actuating or handleblock being shown in full lines; Fig. Q a vertical sectional view, taken on the line 9-9 of Fig. 8; Fig. 10 a similar view on the line 10-- 10 of Fig. 5; Fig. 11. a vertical sectional view showing the magazine, the ejector and the housing for the breech-bolt; Fig. 12 an end elevation of the housing; Fig. 13 a longitudinal sectional view of the cap or closure for the rear end of the housing; Fig. 14 a top plan view of the bolt; Fig. 15 a longitudinal sectional view, taken on the line 15--i5 of Fig. i4; Figfl a plan view of the bolt as seen from the under side Fig. 17 a side eleva,- tion. of the extractor; Fig. 18 a pers view there-nf as seen from the under face; Fig. i9 a horizontal sectional i', taken on the line .1Q-19 of Fig. 11; Fig. 2U a perspective View of the bottom plate 'of the magazine, the spring and elevating-plate for the cartridges; Fig. 2 1 a perspective view of the actuating or handle-block; Fig. 22 a perspective view of the locking-pin and its reg lated parts; Fig. 23 a vertical sectional view,

taken on the line 23-23 of Fig. 5; Fig. 24 a side elevation of the locking-pin which con nects the actuating or handle-block to the runner-bar or actuating-rod; Fig. 25 aside elevation of the forward portion of the gun, showing the forestock in position; Fig. 26 a horizontal sectional view on the line 26-26 of Fig. 25; Fig. 27 a perspective view of the forward portion of the gun, the barrel being broken away and the valve-handle omitted; Fig. 28 a perspective view of the forward end of the runner-bar or actuating rod; Fig. 29 a similar view of the latch and the block upon which it is pivotally mounted; Fig. 30 a perspective view of the forward portion of the runway or guiding member for'the actuating-rod or runner-bar; Fig. 31 a plan view of the sightslide; Fig. 32 a vertical transverse sectional view on the line 32-32 of Fig. 2; Fig. 33 a top plan view of a portion of the barrel, showing the lugs which hold the sight; Fig. 34: a vertical sectional view on the line 34M? l of Fig. 1; Fig. 35 a detail perspective view of the forward portion of the trigger-plate; Fig. 36 a sectional view on the line 36-36 of Fig. 8 of the bolt and firing-pin; Fig. 37 a perspective view ofthe cartridge-clip; Fig. 38 a side elevation of a modified construction of the ruimer-bar and its connections; Fig. 39 a horizontal sectional view thereof, shom'ng a modified form of actuating or handle-block.

used in conjunction with said runner-bar; Fig. 40 a vertical sectional view, taken through the handle, and showing the connection thereof with the breech-bolt; and Fig. i1 a transverse sectional view, taken on the line 41-41 of Fig. 38.

My present invention, except as to certain details of construction, is an improvement upon that set forth in my co-pending application filcd on or about the 6th day of May, 1302, Serial No. 106,177.

The main object of the invention is to -perfeet certain detalls of the structure shown in the applic ation acove referred to, and to render the arm generally more efiicient.

The improvements will be noted in the following description, and those features which are essentially novel and not modifications of the former construction will likewise be set forth in detail.

IOOl

IIO

.Referring to Figs. 1 toi37 inclusive offthe is provided with a recess or socket 6, for thev reception of the rear end of the upper inember 7 of the forestock. The two portions of the forestoek are held in position around the barrel, and the member 2 about the gaschamber (hereinafter referred to), by a sleeve or collar 8, which slips over said parts and'is held in place by spring-catches 9 (see Fig. 25), which are recessed in the sides of the member 2. A second sleeve or collar,.10, covers the forward end of the member 2.. A projection 11, formed on said member 10 its around the outer end ofthe as-receiving cylinder or chamber 12. Sai sleeve or collar 10 is retained in its position by a through- -pin 13 (see Figs. 2 and 26), the pin being reduced at one end and entering a hole formed in the sleeve or collar, while the other end is somewhat enlarged and is provided with a laterallyextending lug or projection 14,

which, when the pin or key is turned by the lever 15 attached thereto, passes beneath the inner face ofthe collar 10 and out of line with the slot 16 formedin said member 10 through which the lug or projection passed when the pin was inserted in place.

. The lever or handle 15 is provided with an inwardly-projecting nose 17, which' passes over a cam or raised face 19 formed upon the sleeve or collar 10 asthe pin is rotated and .the lever 1 5' carried from a vertical to a horizontal position. `When in the latter position the nose 17 will have passed off the cam face and the pin be held against rotation except upon the application of force to the outer end of lever 15.

The gas-chamber 12 is in communication with the barrel near its outer end through an l opening 20` (Figs. 2 and 26), the passage of the gas through said opening being controlled by a rotary valve 21, provided with a port 22,

which permits communication between the;

valve and the gas-chamber, as indicated in Fig; 2. The valve is also provided with a second port or opening, 23, which, when thevalveis rotated to a position opposite that shown in Fig. 2, will be in communication with the atmosphere, and communication betvfieeii the gas-chamber and barrel will be cui'J o In order to keep the yvalve to its seatin the forward end of the gas-chamber, I employ a bushing or collar 24, which is screwed into the end of said chamber (as best illustrated 1n Fig. 2) said collar being provided with lugs 25, which bear against the under faces of the outwardly-projecting membersvor arms 26 of the sleeve or collar 10. These arms 26,

therefore, prevent the bushing 24 from rotating so long as the sleeve or collar is held in place, and consequentlyv the valve is always retained in proper position within' theI for- Award end of the gas-chamber.

The valve-is provided with a stem 27, to which is pivotally attached an lB -shaped lever 28. which bears upon the inclined faces on the outer end of the stem 27, serving to hold the lever depressed, as in the-position shown in full lines in Fig. 26, or in an elevated position, as indicated insdotted lines in said figure.n The stem 27 is provided with a-lateral projection 27@l or made of such width that the valve may be turned through but half a revolution. since the stem or projection comes into contact 'with one or another of the arms This lever carries a spring 29,

26, the arran ement being such that one or that the valve will always be brought to andv maintained in vproper position. i

The outer end of lever 28 is provided The rear end of the barrel 3 is secured to the frame, as shown in Fig. 1, the frame being made sufficiently heavy at this' point to be provided v:with a groove or channel 32,. having an inclined face 33 adjacent to the end of the barrel, and likewise provided with a series of ribs 34 (Fig. 11). The breechchamber thus formed isl designed to receive the forward end of the breech-bolt 3 5, said bolt being .formed at its forward end with ribs 36, having inclined faces 37, ribs 36 passing in between ribs 34 and fitting'within the groove 32 and against the face 33 when the bolt is shoved to place and rotated, as hereinafter described. The rear end of the bolt is provided with a series 'of laterally-extending ribs or projections 38, which work in corresponding grooves 39 formed inthe housing or` rearward extension 40 of the frame. The

forward end of said housing is provided with an internal groove or channel 41, see Fig. 3,

-int'o which ribs 38 pass when the breech-bolt is moved forwardto the position shown in Figs. 1 and 4. The rear end of the housing is closed by a cap 42, provided with lugs 43, which interlock with similar lugs 44 formed upon the rear end of the housing, as best shown in Fig. 11; vThe cap is also provided with a second series of lugs 45, which when Y the cap is in place and rotated come into alinement with ribs 39a, intermediate the grooves 39 formed in the housing 40. A

spring-'pressed pin 46 is mounted in one of said ribs 39a and takes into a socket or recess formed .in the face of the correspondinglu 45. This socket or recess is shown in dotte lines-in Fig. l.

A coiled spring 47` (Figs. 3 and 8) is placed in the Icap 42, and is in direct alinement with clearly shown in Figs. 14 and 15, and is provided with a downwardly-projecting lip 52 which, when lthe extractor is in its normal position, lies within a recess 53 yformed in the forward end of the breech-bolt, and into which the head of the shell or cartridge projects when the bolt is closed, as shown in Figs. 1 and 4'.

A recess is formed in the outer face of the breech-bolt for the reception of the extractor, and thereis an elongated opening 54 V(Figs. 14 and 15)'in the bolt in line with said recess, a second opening 55 being also provided at its forward end. A

As will be seen upon reference to Fig. 17,v

` the extractor is curved or bowed slightly,

ward wall of the openin and when put in position the lug 49 passes into the opening 54 and lug 51 enters o ening 55. A shght'downward and forwar pressure upon the extractor will thencause the lip 50 to pass into aisocket 54, while at the same time the lug 51, which is given a sli ht forward inclination, will bind against the or- 55. When the parts are thus ositioned, t e rear end ofthe extractor will ave assed down into the re-V Y cess and the body t ereof will lie flush with the outer face of the bolt. The lip50 locks the extractor in place, but 'by reason of the inclination 'ven to the o enin 55 and lu g1 E g 51', lip 52 will pass over t e en of the cartridge and into the groovel formed aroundA the same as the bolt is pushed to place or, closed.

- The bolt, as will be seen upon reference' Y more particularly to Fi s. 15 and 16, is rovided with a groove or c annel 56, exten ing longitudinally thereof from the forward end and terminating in a lateralopening or en- .largement 57, just in rear of t lsition, or that shown in Fi 4, and is'rotated in the manner hereinafter escribed to 1 ock itv in lace, the u per end or nose ofthe ejectorwil pass into t e enlargement or opening. 57. AThe ejector is held in its uprlght posltlon by a spring (see Fig. 11) which ears u pon` the lower end of a. stem 61, mountedln a behind the lugs formed on the frame. ,lug 79 is provided with a squared face upon downwardly-projecting sleeve or chamber 62, said stem being made hollow for the reception of the stem of a pin 63, the head of which pin bears upon a shoulder 64 on a pivoted latch or lever 65. This latch is provided with a nose or projection 66, which extends through an opening 67 into the magazine or clip-receiving chamber 68. The purose of this latch will be hereinafter set ort'h. Spring 60 thus serves to keep the ejector in its elevated position, and at the same time to throw the latch forwardly and project the nose 66 through the opening 67.

A firing-pin 7 0 is centrally mounted in the bolt, said pin having two collars 71, 72 formed thereon. A spring 73 is interposed between the forward face of collar 71 and a shoulder formed on the bolt, said spring tending normally to force the pin back to the position shown in Fig. 8.'

A lug 74, shown in Figs. 8 and 36, works in a slotl or groove 75 formed in the innerface of the bolt (see Fig. '15), said lug serving to properly position the firing-pin, in the bolt and bring a cut-away portion 7 5'i in the lower face of the collar 72 into alinement with the opening 57, to accommodate the upper end of the ejector 59.

The bolt is provided upon its side face with two helical or s irally-disposedl openings 76 and 77, and wit a socket or depression 78. inwardly-projecting lugs or fingers 79 and 80, preferably formed as integral parts of the actuating or handle-block 81, extend into the openings 76, 77 and a s ring-actuated pin 82, carried by the block, ts in the socket or depression 78 until the bolt nearly reaches the limit of its forward movement. The pin is also provided with a beveled nose or lug 83,

'standing in the path of a cam 84 (Fig. 8)

which serves to force the pin inwardly, and thus withdraw the same from the socket or depression 78, thereby permitting the bolt to be freely acted upon bythe lugs or fingers 79, 86 as the bolt approaches thetlimit of 1ts forward movement. By reason of the melmation' of the openings 76, 77 and fingers 79, 80, the bolt will be given a rotary movement after it has reached the limit of its forward travel, the actuating or handle-block 81 moving forward a slight distance independ- IDO IIO

ently of the bolt after the pin 82 has been released, thereby permitting the lugs to travel through the length of the openings and ca us-A ing the rotation just noted. This rotation Wi l cause the locking of the lugs of the l'cit its rear slde, which has its bearing amst the forward face of the collar 72, said ug at' all times extending between the collars 71 and 72. i 'l Asgfthe bolt is moved forward, the `lug 79 holds the firing-pin and bolt in the position shown in 8, but as the bolt reaches its most clearly in Figs. 5 and 6.

the gun.

seat and is locked therein, the lug. advances the firing-pin to the position shown in Fig. 1, and the gun is then ready for firing.

The actuating or handle-block is provided with oppositely-disposed recesses or ways 85, 86, which embrace tracks or ways 87, 88 formed upon one side of the frame. A track or channel 89 is formed upon the outer side of the frame, (intermediate the tracks or ways 87, 88,) in which works the rear end`of a runner-bar or actuating-rod 90, shown Said rear end is connected to the handle or actuating block 81 by a pin 91 (see Figs. 5, 23 and 24) which passes down through an opening formed in the block and into'a socket or recess 92 in the side face of the runner bar. The pin 91 is provided with `a spring-finger 93 ,thefree end of which binds against an inclined face formed at the lower end of a recess in the actuating orhandle-block and serves to keep the pin in position. The runner-bar or actuating-rod is provided with a lu or projection 94, which is undercut (as bests own in Fig. 6)., 'said lug fitting into a recess 95 (see Fig. 22) and overlying a correspondingly-beveled face 96, thus c serving to more securely lock the runnerbar and actuating or handle-block together. The forward end of the runner-bar isy curved downwardly and inwardly beneath the barrel, and is provided with a shoe or foot-piece 97 having recesses or Ways formed in its side face which work in conjunction with uides or tracks 98 formed upon the side wal s of a supporting and guiding member 99. The rear end of said member 99 is provided with a lug 100, which fits into acorresponding recess formed in the front face of the frame of is provided with a tubular Iextension 101, which makes close telescoping connection with the rear end of the gas-chamber or cylinder 12, as is best shown in Fig. 2. Mounted within said gas-chamber or cylinder is a piston-rod 102, carrying at its forward end a'.

piston 103, preferably composed of a series of split rings and interposed washers, which form a close joint with the gas-chamber. The rear endv of the piston-rod ext-ends through an opening formed in the head of the supporting member 99 and is connected to a block 104, shown in detail in Fig. 29. The

' rod is screwed upon a threaded stud carried -ssv bythe block, being held in position by a setscrew 105. The block is also formed with guides or ways which work in conjunction with the tracks 98 'of the supporting member 99.

ing ,wall 106 at its forward end, which, when The forward end of the member 99v -movement of the It is further provided with an upstandcoupling member110, having hooks 111 and I 1 12 at its opposite ends', is mounted upon the stem or post 108, notches or recesses 113 being provided adjacent to the central opening formed in the coupling member in order that it may be passed down over the lugs 109, andwhen rotated into proper position the lugs will pass out oflline with said notches or recesses and lock the coupling member' against removal from the stem or post.

When the coupling member is rocked, in the act of withdrawing the runner-bar by hand, the hook 112 will pass behind an upstanding post 114 formed as a continuation of the face'107 of the headof the supportingl member v99. cess 115 formed in the upper face'ofthe .shoe 97, said shoe being provided with an inclined face 116 leading to said recess 115 in order that the coupling member may be readilyA swung about its pivot as the runner-bar is moved forwardly into engagement with the coupling member, as shown 1n Fig. 5.

The upright wall of the supporting member 99 is cut away adjacent to the rear end of the coupling member, in orderthat the latter may be swung outwardly as it is engaged by The hook 111 passes into a rebar will be positively actuated. The return iston is effected through the agency of a coiled s ring 119, interposed between the piston an wal of the member 99 prevents the coupling member from turning except when in its extreme forward position, and conse uently the hook 111 is in the recess 115 of t e shoe .97 when the runner-bar is forced rearwardly quently the bolt andvactuating or handle` block, which latter is attached to said runner-bar. y

The hammer 120 issfulcrumed at 121 between Vtwo upstanding lugs .122 extending from the upper face of the removable tang or forward end of thev supporting member 99.

The upstanding trigger-carrying plate 123. The forward end of said plate is provided with two arms 124 (Fig. 35), each having a rounded projection 125 at its forward end, which projections engagev hooks 126 extending rearwardly lfrom the wall of the magazine or` clip-receiving chamber 68, one upon cach side ol the laten 65. Guards 127, extending downwardly from said arms, prevent the accidental actuation of the latch. A bar or rod 128 isl pivotally connected to. the hammer 120, said bar extending rearwardly therefrom and passing through an opening formed in an upright or post 129. A spring 130 encircles the rod,

bearing against a collar or shoulder formed thereonV and the'forward face Vof theupright or post 129. The rod is provided near its rear end and upon the upper 'face thereof with a notch into which passes the lo wer end of a Sear 131, pivoted in the upper end of the post 129. The sear isnormally held down upon the face of the rod by a spring 132,

g which is mounted in a recess formed in the upper portion of the sear, the spring bearing at one end against the upper'. extremity of the post 129 and at its opposite end upon the inner wall of the recess. A dog 133 is pivotally mountedupon an outer extension of the Sear and is normally thrown over the end of the actuating lug 134 of the trigger 135 by a springV 136 which is mounted in a recess formed in the upper end of the scar, and bears at its outer end upon the upper extremity of said dog. The latter is provided with a stop 137 which abuts against the under projecting face of the sear and prevents the dog from swinging out of alinement with the lug 134.

In Fig. 1 the hammer is shown as cocked. It is swung down into such position b the firing-pin and the bolt, the rear end o said pin bearing against the upper end of the hammer during the initial rearward movement of the actuating or handle-block, the bolt through its luv 58 causing the complete depression of the hammer as it passes over the same.

As will be noted upon reference to Fig. 1, the upper end of the hammer projects into the housing in line with the lug 58 formed upon the bolt. As the latter is moved forward the beveled face of said member 58 bears upon the rounded upper end of the.

hammer to a slight extent and depresses the same, the hammer immediately assuming the position shown in Fig. 1, and as the bolt position by a spring 138, and may be locked in such position by a safety slide 139, thus preventing discharge of the'gun. j

` As above noted, the arin may be operated either as a single-loader or a re eater, anda clip designed to hold a series o' cartridges 1s employed when'their use is required. A pccuhar construction of clip is shown, which may be filled and placed in position but held out of operation and the gun used as a singleloader until it be desired to throw the clip and its charge into place. To this endl employ a clip of the form illustrated m Figs. 1,

' 4, 9 and 37, whereinit is shownas provided with inturned edges 140 at the upper and lower sides, and witlLa swell or enlargement 141 which extends outwardly from the rear. face thereof. said swell, thus orming a cross-bar 143. A groove or channel 144 1s formed in the rear wall of the magazine or clip-receiving chamber 68, and when a clip is placed in position therein the swell'or enlar ement 141 lits in said groove or channel, t e nose 66 of the latch entering one or the other of the openings 142 according to the extent to which the 0 en ings 142 are provided in clip with its charge is forced downwardly in the maga'zine. In Fig. 1 the nose is shown as passing into the lower opening, which position the uppermost'cartridge will be 1n alinement with the forward face of the bolt, as indicated in Fig. 9, so that as said bolt 1s moved forwardly the upper cartridge w1ll .be forced out of the clip, upwardly over the inclined face 145 and into position in the breech of the un. n

A presser-p ate 146, having seats or depressions 147 formed in the upper face thereof, bears against the lowermost cartridge 1n the clip and forces the cartridges upwardli7 through the clip by the action of a. lealispring 148, the upper end of wluch 1s at- IOC secured to a rearwardly-projecting arm 149 of a bottom plate 150. This arm andI plate are of such width that after the clip is emptied it may pass out through the bottom of the magazine or clip-'receiving chamber as another clip with its charge is inserted. The presser-plate 146 is provlded with laterally.- projecting lugs 151 (see Figs. 19 and 20) which work in Ways formed in the side walls of the magazine, thereby preventing endWise movement of the presser-plate, which might take place under the action of the leaf spring if not prevented. I Spacing lugs 152, extend outwardly from the side faces of the presserplate and bear against the walls of the magazine, thus preventing lateral deflection of the presserlate. In' other words, these two sets of ugs insure the pro er movement of the presser-plate under t e stress ofthe spring. The bottom -plate 150 is provlded with laterally-extending lugs 153 (see Flgs. 11 and 20) at'the rearward end of its broad portion, said lugs passing into 4recesses or notches 1,51a formed in the lower portion of one of the ribs, which provide ways for the lugs 151, see Fig.- 20. Said plate 1s likewise provided withan undercut tongue 154 (Figs.

5 and 20) which passes into a suitable recess.

formed in the forward wall of the magazine or chamber, a springressed pin or bolt 155 with complemental projections, so that it maybe slipped endwise over the lugs and thus held thereon. In the upper face of'said plate is formed a channel or recess, the forward end of whichis undercut and designed to receive a spring-arm 159, at theA forward end of which is lprovided a stem or post 160, having undercut grooves 16-1, as best shown in Fig. `5. A screw 162 is passed down through the plate 158 and intothe forward,

lug 157, as best indicated in Fig. 32'. This screw serves to hold all the parts in proper position, the rear end of plate-158 (when the same is moved backward to its full extent) abutting against a shoulder -163 formed upon the barreh The plate is likewise provided thereby making a close fit and neat finish at at its forward end with a depending portion 164,'which extends in front of the lug 157,

, this point.

A sight-frame 1.65 is pivoted to the rear end of' plate 158, a cam surface 166 formed on the lower'portion of the frame bearing against the upper end of the spring-arm 159 and serving to hold the frame in itspupright or depressed position according as the cam is thrown to one or the other side of the pivotpoint of the sight-frame.

A slide 167 is mounted upon the frame 165, and is provided with a pivoted latch or thumb-piece .168, which engages notches-169 formed in the side or edge of the frame 165, thus locking --the slide 167 in its adjusted position. As will be seen upon reference to Fig. 31, the edges170 ofthe slide adjacentto the central cut-away portion thereof are beveled or inclined, so vthat when the sightframe is swung down to the position shown in Fig. 32 theslide may move outwardly 4along the same, and said beveled edges will pass into the grooves 161 formed in the postA 160 and thus lockthe sight-frame against upward movement. A screw 171 (shown in dotted lines in Fig. 5) prevents the slide from being moved voff the frame.v The usual for- .Ward 'or standingA sight 17 2 (Figs. 2 and 251 is provided.

ing 142 formed in the clip.

,the pin 82 .carryin In Figs; 38 to 41 inclusive a slight modifi-- cation of the invention is shown. In this case the rear end of the piston-rod 102a-1s connected to a shoe or runner 97a formed as withdrawn 'from engagement with the hook lb as the actuating or handle-block is drawn backward in thef'act of opening the breech. As will be noted upon reference to Fig. 39, the rear end of the runner-bar or actuatingrod 90a has a fair bearing against a shoulder formed on the actuating or handle-block, so that when the gun is operated by the spent gases the breech-bolt will be positively actuated by the movement o f the handle-block and runner-bar. This construction obviates the necessity for the use of the coupling member hereinbefore described.

The operation of the arm shown in Figs.

to 37 inclusive is as follows: A clip, 'with the cartridges therein, is placed in the magazine,

,the presser-plate 146 being forced down by the lowermost cartridge in the clip. If it be designed to use the gun as a single-loader, with the cartridges in the clip held in reserve, the clip is pushed downwardly until the pivoted latch 65 passes into the uppermost open- In this position l the upper cartridge carried by the clip will be out of line with the forward end of the breechbolt and consequently cannot be drawn from the clip by the bolt as it is moved forwardly. The gun may then be loaded by hand, as a single-loader, at which time, of courseuthe valve 21 is rotated so as to bring port 23 into communication with opening 20, thereby venting the spent ases to t e atmosphere and throwing the piston 103 and its connected parts out of operation. A cartridge having been inserted, the bolt is moved forwardly by the actuating or handle-block 81, the breech-bolt in the same direction unti the cam face 84 comes into contact with the beveled nose 83 on the pin, and withdraws the/latter from engagement with the bolt. The bolt at this moment will have been carried fully forward, the ribs 36 thereon having entered the groove 32, while theribs 38 on .the rear portion of the bolt will have passed into roove 41. By reason of the further forwar( movement of' the actuating or handle-block, the inclined IOO IIO

lugs or fingers 79 and 80 Will cause the bolt to berotated, and consequently the ribs on .the bolt will pass behind the corresponding ribs formed on the frame, thereby locking the s 1, except that the clip or holder willbe der rearwardly, it will come into contactwith the ing the shell out of the breech and carrying it rearwardly until it comes into contact with the forward face of the ejector 59, when it will be thrown upwardly and outwardly, as indicated in Fig. 3. As the bolt is moved upper end 'of the hammer 120 and cause the 'same to be swung downwardly'into the 'position shown in Figs. 1 and 3, at which time the bar or rod 128 will have moved against the action of the spring 130 to such an extent as to permit the sear 131 to be thrown into engagement with the recesses formed in the upper face of said bar, thereby holding the hammer in its cocked position ready for the nextdischarge. lf it be desired to use the arm as a magazine-gun,-although manually o erated,-it is only necessary to withdraw t e latch 65 from the upper notch or opening in the clip and allow spring 148 to move the clip, with the cartridges therein, upwardly to a position in which the uppermost cartridge will be in line with the bolt as it is moved forwardly. The cartridges will be continuously fed into alinement with the bolt until the clip is emptied, when the latter may be forced out through the lower portion of the clip-rey ceiving chamber by the insertion of another clip from above, the upper beveled face of the nose 66 permitting the clips to be moved downwardly, it bein unnecessary to withdraw the latch by and. In case it be desired to operatethe gun automatically, the position of valve 21 is changed so as to bring opening 20 into alinement with port 22, or into the position shown in Fig. 2. Upon the discharge of the un, the spent gases will pass through opening 20 into the port 22 and cause a rearward movement of the piston and piston-rod. Inasmuch as the opening 20 is located near the outer end of the barrel, the projectile will have, attained its full velocity and no detrimental effect will result from the use of the spentgases to force back the piston and its rod. As said rod moves rearwardly it carries with it the block 104, and this will also force the shoe and runner-bar in the same direction. The runner-barbeing connected to the .actuating or handle-block, said block with the bolt will be forced rearwardly, and the empty shell withdrawn from the breech and automatically ejected from the gun. The buer springs 47 and 47 1 the latter located in the socket or recess formed in the forward face of the frame in linewith the runway for the shoe 97), will take up an)- shock or jar which might otherwise 'reslt from the forcible movement of the parts. The spring 119 which surrounds the pistonrod and has now been compressed., will next come into action and force the piston forward, carrying with it the piston-rod and runner-bar connected therewith by means of the couplin -member 1 10. The actuating or handle-bloc and bolt will also be carried forward, the latter being moved to its closed position, rotated and locked in place. The same cycle of operations is repeated upon the next discharge of the gun, it being then only necessary for the user to manipulate the triger. g With the construction shown in Figs. 3S to 41 inclusive the same operation as that j ust described takes place, the pivoted hook 90" serving the purpose of the couplingvmember In other words, the coupling is made at a point more remote from the piston.

No claim is herein made to the construction of the sight, that being reserved for a future application.

Having thus described my invention, what I claim is:

1. In a breech-loading firearm, the combination of a barrel; a gas-receiving chamber located adjacent .thereto and communicating therewith; a rotary valvemounted in the forward end of said chamber and controlling the passage between said chamber and the barrel a collar screwed into the forward end of thc gas-chamber and holding the valve in place` said collar having outwardly-extending lugs; a sleeve secured about the forward end of the gas-chamber, said sleeve having outwardlyprojecting arms which abut against the lugs on the collar and thus prevent the collar from turning; and means for properly positioning the valve. i Y

2. In a breech-loading Iirearm, thel combi- IOO nation of a barrel; a gas-receiving chamber y underlying and communicating with the same a rotary. valve mounted in the forward end of the gas-chamber and having two ports, one opening communication between the barrel and gas-chamber, and the other venting the barrel to the atmosphere; a collar or bushing mounted in the forward end o' the gas-chamber and holding the valve in place, said collar having outwardly-extending lugs at its forward end; a sleeve embracing thel barrel and the forward end of the gas-chamber, said sleeve having outward ly-projecting arms, the ends of which overlie the end of the collar and abut against the lugs thereon; and

an actuating handle for the valve.

3. In a breech-loading firearm, the combination of a barrel, a gas-receiving chamber in communication therewith; a valve for .controlling the passage of gas from the barrel to said chamber; a lever for operating said valve; and means for holding the lever in its adjusted position.

I4. In a breech-loading firearm, the combination of a barrel; a gas-receiving chamber in communication therewith; a valve for controlling the passagel of gas from the barrel to said chamber; a stem or post extending out(- wardly from said valve, and having inclined faces upon its outer end; a lever pivoted -on the post and provided with alug'. .0 at its outer end; and a spring carried by t elever, the free end of said spring coacting with the inclined faces upon the post, substantially as described. l

5. In a breech-loading firearm, the combil nation of a barrel; a forestock; a gaschamber underlying the barrel and extending through the forestock; a sleeve embracing said parts; a pin extending through the sleeve, said pin being formed with a locking projection; and means for holding said pin against accidental movement.- y

6. In a breech-loading firearm, the combination of a barrel; a forestock; a gas-chamber underlying the barrel and extending through the forestock; a sleeve 10 embracing said parts; a in extending through the sleeve and forestoc said pin having a locking lug 14 and a nose 17 upon its outer end; and aca-m surface 19 formed on the sleeve in line with nose 17, substantially as described.

7,; In a breech-loading firearm, a clip-holding chamber, having a bottom plate, said plate being formed with a rearwardly-extending narrow sectionspaced away from the end and adjacent side walls of the chamber,

whereby a space for the passage of an empty clip is formed, said plate being likewise provided with laterally-extending lugs which pass into openings inthe side Walls of the chamber and also with-a tongue which interlocks with the forward wall of the chamber. J 8. In a breech-loading firearm, a clip-hold- `ing chamber, having a bottom plate free ofcontact with the rear wall of the chamber and provided with lugs which pass into corresponding openings formed in the inner side faces of the chamber, and likewise provided with a tongue 154 which'interlocks withthe forward wall of the chamber; combined with a spring-pressed bolt to engage and hold the tongue.

9. In a breech-loading firearm, the combination of a clip-holding chamber; a bottom plate therefor having a reduced rear' end forming a U-shaped opening for the passage of the clip; a presser-'plate also provided with a similar y shaped reduced rear,v end and having laterally-extending lugs 151 which work in guides or ways formed in the side walls of the chamber, and likewise provided with lugs 152,which bear against the inner side walls of 'said chamber all of said lugs being located forward of the reduced end; and a Spring interposed between the `bottom plate and presser-plate.

10., In a breech-loading firearm, the combinationA of a clipholding chamber; a latch pivoted adjacent to said chamber an ejector mounted in the frame above the latch; and a single spring acting upon said members.

l1. In a breech-loading firearm, the combination of'a clip-holding chamber; a latch ivoted adjacent thereto and adapted to liold a clip in position in the chamber.; an ejector having a downwardly-projecting stem 61; a pin bearing at its lower end upon the latch; and a spring interposed between the head of said pin and the vlower end of stem 61.-

12. In combination with a trigger plate; a hammer pivoted thereon; a rod pivoted on said hammer vand extending rearwardly therefrom, said rod being provided with a trigger-plate; a sear pivote to the post above the rod; a spring serving to throw the sear into engagement with the rod; a dog pivoted on the sear; a trigger acting in conjunction with said dog; and a spring serving to throw the hammer forward.

13. In combination with a pivoted hammer; a rod pivoted on and extending rearwardly therefrom, said rod having a notch formed in its upper side; a post through which the rear end `of the rod extends; a spring interposed between said post and a collar on the rod a sear pivoted to the post; a spring bearin on the post and the sear and tending to vroc with the rod; a spring-pressed dog pivoted to the sear; and a trigger working in line with the dog.

14. In combination with a pivoted hammer; a rod pivoted on and extending rearwardly therefrom, said rod having a notch formed in its upper side; a post through which the rod extends; a sprin encircling the rod intermediate the post an a collar on the rod; a sear 131 pivoted on the upper end of the post in line with the rod; a spring the scar into engagementvseated in a recess formed in the upper end of bination of aframe provided with a bolt-.

housing having lugs or shoulders formed thereon adjacent yto its rear end; a cap provided with an internal roove and a series of lugs, the parts interloc ing when the ca is placed in position; and a spring-*pressed olt carried by one of said members and coacting with a seat or'recess formed in the o posite` member, to hold the cap against rotatlon and accidental removal.

16. In a breech-loading firearm, the combination of a sliding'bolt an actuating meml ber for said bolt; a gas-o erated mechanism Vprovided with a rearwar extenslon; means carried by the actuating member normally engaging said' rearward extension; and `means for throwing said gas-operated mechanism into or out ofaction, substantially as described. a

17. In a breech-loading firearm, the combination of a bolt; an actuati or handleblockfin o erative connection with said bolt;

' a pivoted atch carried by said block; a gasoperated mechanism provided with a rearwardly-extending member which stands in alinement with the' latch; and means for ,throwing the gas-operated mechanism into or out of action, substantially as described. 18. In a breech-loading firearm, the combination of a bolt ;'an actuating or handleblock in operative relation therewith; a hook ivotally mounted upon said handle-block a arrel; a gas-chamber; means for throwing said chamber into or out of communication with the barrel; a piston mounted in the gaschamber; a runnerbar extendin rear- Wardly from said piston and provide with a hook to engage the hook upon the actuating l or handle-block; and means for opening and bination of a breech-bolt closing communication between the barrel and the gas-chamber.

19. In a'breech-loadinglirearm, the comaving a longitudinal and reciprocatory movement; an actuating or handle-block connections intermediate said block and bolt for moving the latter for- Wardly and rotating the same to lock it inposition; a hook pivoted upon the block; a barrel; a gas-chamber in communication with said barrel; a piston mounted in the gaschamber; a runner-bar'connected to said pisthe lower end of the latc bination of the frame offthe arm provided .with rearwardly-extending hooks; a clipholding chamber; a latch pivoted to the frame adiacent to the chamber, the lower end of the latch extendingdown between the hooks; atrigger-plate having forwardly-projecting arms engaging and interlocking with the hooks; and a guard for the lower end of the latch carried by the trigger-plate.

22. In -a breech-loading firearm; the combination of the frame of the arm provided with rearwardly-extending hooks; a clipholding chamber; a latch pivoted to the frame adjacent to the chamber, thelower end of the latch extending down between the hooks; a trigger-plate having Jforwardly-projecting arms engaging and interlocking with the hooks; and a pair of guards extending downwardly from the trigger-plate, said guards being arranged ulpon opposite sides of In testimonT whereof I have signed my name to this specification in the presence of two subscribing witnesses.

lMANUEL MONDRAGON.

Witnesses VICTOR HERNANDEZ, n SALvADoRE DOMINGUEZ. 

